NSh Series Tractor Gear Pump | Soviet MTZ Belarus Tractor Replacement

Genlu Hydraulic proudly introduces our NSh (НШ) Series heavy-duty external hydraulic gear oil pumps engineered for agricultural, tractor, and mobile machinery fleets. Specifically designed to withstand intensive duty cycles within the main hydraulic hitch lifters, implements, and hydrostatic steering systems of Soviet and Eastern European heritage tractors, this line serves as a precision-manufactured, drop-in replacement for the classic MTZ (Minsk Tractor Works / Belarus) and HTZ equipment configurations. We specialize in cross-referencing and supplying the complete displacement matrix, including NSh 16, NSh 25, NSh 32, NSh 40, NSh 50, and NSh 100, featuring the highly reinforced 10M-3, 14M-3, and 16M-3 third-generation round/oval casing classifications.

Acting as the unyielding power generator for tillage, harvesting, and material handling under dusty and high-vibration conditions, Genlu’s NSh series conforms strictly to ГОСТ (GOST) national operational templates and modern ISO module specifications. We guarantee 100% Drop-in Interchangeability across standard Soviet-spec invoute splines (4-spline / 6-spline inputs), rectangular 4-bolt mounting flanges, diamond-shaped port sealing arrangements, and specific rotation dynamics (Left-Hand “Л” / Right-Hand configurations). Every single production pump undergoes 100% full-pressure anti-contamination bedding-in, volumetric flow consistency testing, and low-idle pressure pickup audits, ensuring smooth hydraulic lift response under harsh multi-ton field conditions.

Technical Specifications 

• Product Line: NSh (НШ) Series Fixed Displacement External Gear Pump for Agricultural/Tractor Applications

• Core Covered Code Formats: NSh-16, NSh-25, NSh-32, NSh-40, NSh-50, NSh-100 (M-3, HW, and standard variants)

• Displacement Parameters (Theoretical Volumetric Output):

  • NSh 16 Frame: 16.0 $cc/rev$

  • NSh 32 Frame: 32.0 $cc/rev$

  • NSh 50 Frame: 50.0 $cc/rev$

  • NSh 100 Frame: 100.0 $cc/rev$

• Design Generation Identifier: M-3 Series (Denotes upgraded high-pressure 3rd-generation housing profiles with reinforced structural margins)

• Maximum Continuous Working Pressure: 16.0 MPa (160 bar)

• Maximum Intermittent Peak Surge Pressure: 21.0 MPa (210 bar)

• Rated Rotational Speed: 2400 rpm

• Maximum Allowable Input Speed: 3000 rpm

• Rotational Orientation Metrics: Divided strictly into Counter-Clockwise (Left-Hand, designated with “Л”) and Clockwise (Right-Hand) configurations based on engine drive take-offs

• Volumetric Efficiency Target Boundary: $\ge 94\%$ under a standard 16 MPa load at rated tractor engine RPMs

Key Technical Advantages:

• Seamless GOST Dimension Cross-Referencing & Precise Spline Match: Designed for a direct match with classic models like the MTZ-80, MTZ-82, and MTZ-1221. By matching the original specifications for invoute drive splines and mounting bolt spacing, the pump installs easily without requiring line modifications or shaft adapters.

• Bimetallic Floating Bushings with Automatic Axial Compensation: The pump core utilizes highly loadable floating bimetallic bushings. By tapping high-pressure fluid from the outlet to provide micro-axial clamping force against the gear faces, the pump maintains its $\ge 94\%$ volumetric rating over long operational cycles, preventing the efficiency loss common in low-tier gear pumps during hot weather.

• High-Yield Extruded Alloy Casing with Shock-Surge Containment: To handle the intense pressure spikes that occur when a tractor’s rear three-point hitch strikes buried rocks or hard soil, the M-3 casing is forged from specialized high-tensile aluminum alloy or nodular cast iron. This design increases burst resistance by 35% over standard configurations, keeping the housing safe from permanent distortion at 21 MPa peak limits.

• Triple-Stage Composite Rotary Shaft Protection: Because farming equipment routinely works in dusty, wet, and mud-splattered environments, the input shaft is protected by a triple-stage composite lip-seal package. This system prevents abrasive grit from scoring the bearing interfaces while keeping hydraulic fluid from escaping into the tractor’s main engine timing gear case.

Application Areas:

• MTZ Belarus Tractor Hydraulic Systems: Main power fluid generation for three-point hitch position control, rear implements, and hydrostatic power steering (HMT) on MTZ-80, MTZ-82, MTZ-920, MTZ-1025, and MTZ-1221 tractors.

• Harvesting & Forage Equipment: Header lifting cylinders and grain unloading auger hydraulic setups for mid-to-large size combine harvesters.

• Mobile Implements & Utility Chassis: Hydraulic power take-offs for truck-mounted cranes, farm tippers, and front-end utility loaders built on Eastern European chassis designs.

Expert Maintenance Tips:

• Verify Rotational Direction Prior to Startup: Correct rotation alignment is essential for NSh series gear pumps. Check the tractor’s engine drive-shaft direction before mounting the pump, and never substitute a Left-Hand (Л) pump for a Right-Hand drive shaft. Reversing rotation routes high system pressure directly against the low-pressure shaft lip seal, blowing it out within seconds and damaging the internal components.

• Flush the Oil Reservoir and Replace Old Filtration Blocks: Older tractors often have metallic shavings, sludge, and field dust settled at the bottom of their hydraulic tanks. When swapping in a new pump, always clean the fluid reservoir and fit a new 100-micron suction strainer. Reusing dirty fluid will quickly score the precision faces of the new gears and bushings.

• Carefully Seat the Interlocking Backpressure Seals: During routing tear-downs or seal overhauls, pay close attention to the figure-3 or figure-8 rubber balancing rings located behind the floating bushings. These seals must be oriented correctly and installed flat without twisting; any pinching will disable the automatic pressure compensation, causing high internal leakage and rapid oil overheating.